Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy

Yanqiang Qiao; Xiping Guo; Xuan Li

doi:10.1016/j.corsci.2014.10.053

Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy

Yanqiang Qiao, Xiping Guo, Xuan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

Hot corrosion behavior of an Nb-Ti-Si alloy and its silicide coating in Na₂SO₄-25wt.% NaCl molten salts at 900°C was investigated. For the bare alloy, a thick and porous corroded scale (Na-containing oxides) was formed after hot corrosion. The silicide coating showed a good oxidation resistance at 900°C, while the presence of the molten salts aggravated the damage process of the silicide coating by forming a thick corroded scale which mainly consisted of a Na₂TiSi₂O₇ outer layer and a porous and cracked NaNbO₃+Na₂TiSi₂O₇ inner layer. The possible hot corrosion mechanism of the silicide coating has been explored.

Original language	English
Pages (from-to)	75-85
Number of pages	11
Journal	Corrosion Science
Volume	91
DOIs	https://doi.org/10.1016/j.corsci.2014.10.053
State	Published - 1 Feb 2015

Keywords

A. Intermetallic
A. Metal coatings
C. Hot corrosion
C. Oxidation

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10.1016/j.corsci.2014.10.053

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title = "Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy",

abstract = "Hot corrosion behavior of an Nb-Ti-Si alloy and its silicide coating in Na2SO4-25wt.% NaCl molten salts at 900°C was investigated. For the bare alloy, a thick and porous corroded scale (Na-containing oxides) was formed after hot corrosion. The silicide coating showed a good oxidation resistance at 900°C, while the presence of the molten salts aggravated the damage process of the silicide coating by forming a thick corroded scale which mainly consisted of a Na2TiSi2O7 outer layer and a porous and cracked NaNbO3+Na2TiSi2O7 inner layer. The possible hot corrosion mechanism of the silicide coating has been explored.",

keywords = "A. Intermetallic, A. Metal coatings, C. Hot corrosion, C. Oxidation",

author = "Yanqiang Qiao and Xiping Guo and Xuan Li",

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T1 - Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy

AU - Qiao, Yanqiang

AU - Guo, Xiping

AU - Li, Xuan

PY - 2015/2/1

Y1 - 2015/2/1

N2 - Hot corrosion behavior of an Nb-Ti-Si alloy and its silicide coating in Na2SO4-25wt.% NaCl molten salts at 900°C was investigated. For the bare alloy, a thick and porous corroded scale (Na-containing oxides) was formed after hot corrosion. The silicide coating showed a good oxidation resistance at 900°C, while the presence of the molten salts aggravated the damage process of the silicide coating by forming a thick corroded scale which mainly consisted of a Na2TiSi2O7 outer layer and a porous and cracked NaNbO3+Na2TiSi2O7 inner layer. The possible hot corrosion mechanism of the silicide coating has been explored.

AB - Hot corrosion behavior of an Nb-Ti-Si alloy and its silicide coating in Na2SO4-25wt.% NaCl molten salts at 900°C was investigated. For the bare alloy, a thick and porous corroded scale (Na-containing oxides) was formed after hot corrosion. The silicide coating showed a good oxidation resistance at 900°C, while the presence of the molten salts aggravated the damage process of the silicide coating by forming a thick corroded scale which mainly consisted of a Na2TiSi2O7 outer layer and a porous and cracked NaNbO3+Na2TiSi2O7 inner layer. The possible hot corrosion mechanism of the silicide coating has been explored.

KW - A. Intermetallic

KW - A. Metal coatings

KW - C. Hot corrosion

KW - C. Oxidation

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DO - 10.1016/j.corsci.2014.10.053

M3 - 文章

AN - SCOPUS:84916233075

SN - 0010-938X

VL - 91

SP - 75

EP - 85

JO - Corrosion Science

JF - Corrosion Science

ER -

Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy

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Keywords

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